US20110194990A1 - Method of fabrication visible light absorbed TiO2/CNT photocatalysts and photocatalytic filters - Google Patents
Method of fabrication visible light absorbed TiO2/CNT photocatalysts and photocatalytic filters Download PDFInfo
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- US20110194990A1 US20110194990A1 US12/662,212 US66221210A US2011194990A1 US 20110194990 A1 US20110194990 A1 US 20110194990A1 US 66221210 A US66221210 A US 66221210A US 2011194990 A1 US2011194990 A1 US 2011194990A1
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- titanium dioxide
- carbon nanotubes
- dioxide layer
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 86
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 74
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 52
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 49
- 239000000758 substrate Substances 0.000 claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 34
- 239000004744 fabric Substances 0.000 claims description 21
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 10
- 239000004917 carbon fiber Substances 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000000231 atomic layer deposition Methods 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- XGZNHFPFJRZBBT-UHFFFAOYSA-N ethanol;titanium Chemical compound [Ti].CCO.CCO.CCO.CCO XGZNHFPFJRZBBT-UHFFFAOYSA-N 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 229910052743 krypton Inorganic materials 0.000 claims description 2
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052754 neon Inorganic materials 0.000 claims description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052724 xenon Inorganic materials 0.000 claims description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001782 photodegradation Methods 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 description 10
- 238000007146 photocatalysis Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000003980 solgel method Methods 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000002048 multi walled nanotube Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002109 single walled nanotube Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
Images
Classifications
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- B01J35/39—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
- B01J21/185—Carbon nanotubes
-
- B01J35/58—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0238—Impregnation, coating or precipitation via the gaseous phase-sublimation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
Definitions
- the present invention relates to method of fabricating TiO 2 /CNT photocatalysts and a photocatalytic filter provided by the same and, more particularly, to a method of fabricating visible light absorbed TiO 2 /CNT photocatalysts and a photocatalytic filter provided by the same.
- a photocatalyst is a material that can provide various functions such as sterilization, deodorization, and cleaning by the free radicals thereof being generated after exposure to light.
- Many materials have been taken as the photocatalyst material, and among them titanium dioxide is the mostly used one.
- a titanium dioxide film is usually formed by using a sol-gel method, but the provided photocatalyst titanium dioxide film can work (be able to generate free radicals) only under the exposure to UV lights. Therefore, if a conventional photocatalyst titanium dioxide film is illuminated with visible light (with wavelength of longer than 400 nm), free radicals cannot be generated since only with the exposure to UV lights can the conventional photocatalyst be excited to an excited state.
- an artificial UV light source should be provided to illuminate the photocatalyst otherwise the photocatalyst can be used only at an outdoor site, i.e., with naturally-occurring UV.
- US 2005/0239644 disclosed a method of fabricating photocatalysts, in which an active sol-gel is coated on a substrate to provide a titanium dioxide film.
- the precursor used therein comprises n-butyl titanate, ethane, diethanolamine, and water.
- the photocatalysts titanium dioxide film provided thereof still cannot operate without the illumination of UV lights, whereby the application of the photocatalysts is quite limited to the environment having naturally-occurring UV light or should be assisted with an artificial UV light source.
- a conventional photocatalyst filter is shown, which is made by dipping a cloth such as a polyethylene fiber cloth in a titanium dioxide solution to form a titanium dioxide layer 12 on the cloth fiber 11 , and subsequently followed with a drying process.
- the surface area of the formed titanium dioxide layer is small due to the small surface area of the fiber cloth, which results in a small active surface of the photocatalyst filter.
- some titanium dioxide molecules may aggregate and form agglomeration (granules) thus reducing the uniformity of titanium dioxide layer and resulting in a negative influence to the photodegradation efficiency of the photocatalyst.
- the present invention provides a method of fabricating visible light absorbed TiO 2 /CNT photocatalysts, which comprises steps: (a) providing a substrate; (b) forming a plurality of carbon nanotubes on the substrate; (c) providing a titanium source and an oxygen source; and (d) forming at least one titanium dioxide layer on the carbon nanotubes.
- the photocatalysts made by the method of the present invention are visible light absorbed photocatalysts that can be workable with visible light, LTV light, or both (not only workable with UV light exposure).
- the photocatalysts having TiO 2 /CNT structure made by the method of the present invention can be applied to a wider range compared with that of prior arts due to the visible light absorbed characteristic thereof, the titanium dioxide layer formed on the CNTs has high uniformity and therefore the photodegradation efficiency of the photocatalysts made by the method of the present invention is an improvement.
- the step (d), preferably the titanium dioxide layer may be formed on the carbon nanotubes by an atomic layer deposition method.
- an atomic layer deposition method is used to form the titanium dioxide layer, a titanium dioxide layer with high uniformity can be obtained without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO 2 /CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts.
- the titanium source may be selected from a group consisted of: titanium tetrachloride, tetraethoxy titanium, titanium isopropoxide, and mixtures thereof; and preferably the oxygen source may be selected from a group consisted of: water, hydrogen peroxide, oxygen, ozone, and mixtures thereof.
- the formation of the titanium dioxide layer in the step (d) is performed at a temperature of 50 to 400° C.; a pressure of 1 to 50 mbar; and an atmosphere comprising an inert gas such as nitrogen, neon, argon, krypton, xenon, or mixtures thereof.
- the method of fabricating photocatalysts of the present invention may further comprise a step (e) after the step (d): removing the substrate to obtain a plurality of carbon nanotubes covered with the titanium dioxide layer.
- the carbon nanotubes lifted from the substrate are presented in a form of powder, which can be further applied to various usages such as sterilization powder, paint additives, fertilizer, or sanitary articles.
- the step (d) may be repeated for 1 to 1500 times.
- the thickness of single titanium dioxide layer is preferably 0.5 ⁇ to 1.7 ⁇ , more preferably 0.5 ⁇ to 1.0 ⁇ .
- the method of fabricating photocatalysts of the present invention preferably further comprises a step (d1) after the step (d): annealing the carbon nanotubes that are located on the substrate and covered with the titanium dioxide layer.
- the substrate is preferably a silicon-based substrate, a quartz substrate, or a glass substrate.
- the substrate may preferably be a carbon fiber cloth in order to provide a photocatalyst filter.
- the carbon nanotubes may be preferably single-wall or multi-wall carbon nanotubes.
- the present invention also provides a photocatalytic filter, which comprises: a substrate, a plurality of carbon nanotubes, and a titanium dioxide layer.
- the carbon nanotubes locate on the substrate, wherein ends of the carbon nanotubes connect to the substrate.
- the titanium dioxide layer covers the surface of the carbon nanotubes.
- the photocatalytic filter of the present invention is a visible light absorbed photocatalysts filter that can be workable with visible light and therefore can be applied into various uses such as the filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter.
- a traditional photocatalyst filter cannot work if the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature if no UV light is provided and therefore is limited to the place where it is used.
- a photocatalysts filter is made by dipping a fiber cloth in a solution of titanium dioxide to form a titanium dioxide layer on the fiber cloth. Consequently, the surface area of the active surface of the photocatalysts filter is small since the surface area of the fiber cloth, on where the titanium dioxide layer can be formed, is small, and hence the photocatalysis efficiency cannot be efficiently increased.
- the area of the surface where the titanium dioxide layer can be formed on is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention is an improvement.
- the substrate is preferably a carbon fiber cloth.
- the thickness of the titanium dioxide layer is preferably 0.5 ⁇ to 1000 ⁇ .
- the titanium dioxide layer covering the surface of the carbon nanotubes is preferably formed by an atomic layer deposition method.
- the length of the carbon nanotubes is preferably 5-300 ⁇ m, but is not limited thereto.
- the carbon nanotubes may preferably be single-wall or multi-wall carbon nanotubes.
- FIG. 1 is a schematic view of a conventional photocatalyst filter
- FIGS. 2A-2C show a process flow chart of fabricating a visible light absorbed TiO 2 /CNT photocatalysts of the example 1;
- FIG. 3 is a schematic view of a photocatalyst filter of the example 2.
- FIG. 4 is a schematic cross section view of a photocatalyst filter of the example 2.
- FIGS. 5A-5D show a process flow chart of fabricating a visible light absorbed TiO 2 /CNT photocatalysts of the example 3.
- FIGS. 2A-2C a process flow chart of fabricating a visible light absorbed TiO 2 /CNT photocatalysts is shown.
- a substrate 21 is provided as shown in FIG. 2A , wherein a silicon-based substrate is used.
- a plurality of carbon nanotubes 22 is formed on the substrate 21 by a CVD method, as shown in FIG. 2B .
- a titanium source and an oxygen source are provided, and (d) by using an atomic deposition method, with conditions of 150° C.
- the titanium source and the oxygen source are reacted to form a titanium dioxide layer 23 on the carbon nanotubes 22 .
- the above step (d) is repeated for 800 times to increase the thickness of the titanium dioxide layer 23 .
- an annealing process is performed on the carbon nanotubes 22 coated with the titanium dioxide layer 23 (not shown). Therefore, a visible light absorbed photocatalysts comprising a substrate 21 having carbon nanotubes 22 thereon, in which the carbon nanotubes 22 are coated with the titanium dioxide layer 23 , is obtained.
- the titanium source used herein is titanium tetrachloride and the oxygen source used herein is water.
- the photocatalyst of the present example is made by the utilizing of an atomic layer deposition method, the using of titanium tetrachloride as the titanium source, and the forming of nano-scaled titanium dioxide layer, and therefore is visible light absorbable, which cannot be realized by the conventional photocatalyst.
- the titanium dioxide layer of the photocatalysts of the present example has very high uniformity without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO 2 /CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts.
- the photocatalysts having TiO 2 /CNT structure made by the method of the present invention can be applied to a wider range compared with that of prior arts due to the visible light absorbed characteristic thereof, the titanium dioxide layer formed on the CNTs has high uniformity and therefore the photodegradation efficiency of the photocatalysts achieved by the method of the present invention is an improvement.
- the photocatalysts filter of the present example comprises a substrate 21 (i.e. the carbon fiber cloth), a plurality of carbon nanotubes 22 , and a titanium dioxide layer 23 .
- the carbon nanotubes 22 form on the surface of the substrate 21 , ends 221 of the carbon nanotubes 22 connect to the surface of the substrate 21 , and the titanium dioxide layer 23 covers the surface of the carbon nanotubes 22 formed on the substrate 21 .
- the length of the carbon nanotubes 22 is about 300 ⁇ m.
- the titanium dioxide layer 23 is formed covering the carbon nanotubes 22 and the substrate 21 (i.e. the carbon fiber cloth) by an atomic layer deposition method, and therefore the photocatalysts filter 2 is visible light-absorbable and can be applied into various uses such as a filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter. In contrast, a traditional photocatalyst filter cannot work if the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature if no UV light is provided and therefore is limited to the place where it is used.
- the traditional photocatalyst filter may have a problem is that the active surface thereof is small since the surface area of the fiber cloth, where the titanium dioxide layer can be formed on, is small, and hence the photocatalysis efficiency cannot be efficiently increased.
- the area of the surface on where the titanium dioxide layer can be formed is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention can be efficiently increased.
- the energy band structure of the photocatalyst filter may be changed due to the core/shell (carbon nanotube/titanium dioxide layer) structure of the present invention, which may contribute to the increasing of the light absorbing efficiency and the photocatalysis efficiency of the photocatalyst filter.
- FIGS. 5A-5D a process flow chart of fabricating a visible light absorbed TiO 2 /CNT photocatalysts is shown.
- a silicon-based substrate 24 is provided as shown in FIG. 5A .
- a plurality of carbon nanotubes 22 is formed on the substrate 24 by a CVD method, as shown in FIG. 5B .
- a titanium source and an oxygen source are provided, and (d) by using an atomic deposition method, with conditions of 150° C. of temperature, 1.5 mbar of pressure, and at a nitrogen atmosphere, the titanium source and the oxygen source are reacted to form a titanium dioxide layer 23 on the carbon nanotubes 22 .
- step (d) is repeated for 800 times to increase the thickness of the titanium dioxide layer 23 .
- step (d1) an annealing process is performed on the carbon nanotubes 22 coated with the titanium dioxide layer 23 (not shown).
- the silicon-based substrate 24 is removed to obtain the photocatalysts of the present example, as shown in FIG. 5D , wherein the photocatalysts of the present example comprises carbon nanotubes 22 coated with the titanium dioxide layer 23 .
- the titanium source used herein is titanium tetrachloride and the oxygen source used herein is water.
- the photocatalysts prepared in the present example may be used as visible light absorbed photocatalyst powders and can be applied into various uses such as sterilization powder, paint additives, fertilizer, or sanitary articles.
- the present invention produces a method of fabricating visible light absorbed TiO 2 /CNT photocatalysts by utilizing an atomic layer deposition method with the use of titanium tetrachloride as the titanium source and water as the oxygen source, and therefore the photocatalysts made by the present invention are visible light absorbable, which cannot be realized by the conventional photocatalyst.
- the titanium dioxide layer of has very high uniformity without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO 2 /CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts.
- the present invention provides a photocatalyst filter having a core/shell (carbon nanotube/titanium dioxide layer) structure, and as a result the photocatalyst filter of the present invention is visible light absorbable and can be applied into various uses such as filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter.
- a traditional photocatalyst filter cannot work when the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature while no UV light is provided and therefore is limited to the place where it is used (i.e., a site with naturally-occurring UV light).
- a photocatalysts filter is made by dipping a fiber cloth in a solution of titanium dioxide to form a titanium dioxide layer on the fiber cloth. Consequently, the surface area of the active surface of the photocatalysts filter is small since the surface area of the fiber cloth, where the titanium dioxide layer can be formed on, is small, and hence the photocatalysis efficiency cannot be efficiently increased.
- the area of the surface on where the titanium dioxide layer can be formed on is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention is an improvement.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to method of fabricating TiO2/CNT photocatalysts and a photocatalytic filter provided by the same and, more particularly, to a method of fabricating visible light absorbed TiO2/CNT photocatalysts and a photocatalytic filter provided by the same.
- 2. Description of Related Art
- A photocatalyst is a material that can provide various functions such as sterilization, deodorization, and cleaning by the free radicals thereof being generated after exposure to light. Many materials have been taken as the photocatalyst material, and among them titanium dioxide is the mostly used one. In the prior arts, a titanium dioxide film is usually formed by using a sol-gel method, but the provided photocatalyst titanium dioxide film can work (be able to generate free radicals) only under the exposure to UV lights. Therefore, if a conventional photocatalyst titanium dioxide film is illuminated with visible light (with wavelength of longer than 400 nm), free radicals cannot be generated since only with the exposure to UV lights can the conventional photocatalyst be excited to an excited state. Accordingly, when a conventional photocatalyst titanium dioxide film is used to provide functions such as sterilization, deodorization, and cleaning, an artificial UV light source should be provided to illuminate the photocatalyst otherwise the photocatalyst can be used only at an outdoor site, i.e., with naturally-occurring UV.
- US 2005/0239644 disclosed a method of fabricating photocatalysts, in which an active sol-gel is coated on a substrate to provide a titanium dioxide film. The precursor used therein comprises n-butyl titanate, ethane, diethanolamine, and water. However, the photocatalysts titanium dioxide film provided thereof still cannot operate without the illumination of UV lights, whereby the application of the photocatalysts is quite limited to the environment having naturally-occurring UV light or should be assisted with an artificial UV light source.
- Reference with
FIG. 1 , a conventional photocatalyst filter is shown, which is made by dipping a cloth such as a polyethylene fiber cloth in a titanium dioxide solution to form atitanium dioxide layer 12 on the cloth fiber 11, and subsequently followed with a drying process. However, the surface area of the formed titanium dioxide layer is small due to the small surface area of the fiber cloth, which results in a small active surface of the photocatalyst filter. Also, some titanium dioxide molecules may aggregate and form agglomeration (granules) thus reducing the uniformity of titanium dioxide layer and resulting in a negative influence to the photodegradation efficiency of the photocatalyst. - Therefore, it is desirable to provide an improved photocatalyst filter and a method of providing the same to obviate the aforementioned problems and enable the photocatalyst filter to be usable (operable) under the exposure of visible light and UV light.
- The present invention provides a method of fabricating visible light absorbed TiO2/CNT photocatalysts, which comprises steps: (a) providing a substrate; (b) forming a plurality of carbon nanotubes on the substrate; (c) providing a titanium source and an oxygen source; and (d) forming at least one titanium dioxide layer on the carbon nanotubes.
- The photocatalysts made by the method of the present invention are visible light absorbed photocatalysts that can be workable with visible light, LTV light, or both (not only workable with UV light exposure). The photocatalysts having TiO2/CNT structure made by the method of the present invention can be applied to a wider range compared with that of prior arts due to the visible light absorbed characteristic thereof, the titanium dioxide layer formed on the CNTs has high uniformity and therefore the photodegradation efficiency of the photocatalysts made by the method of the present invention is an improvement.
- According to the method of fabricating photocatalysts of the present invention, the step (d), preferably the titanium dioxide layer may be formed on the carbon nanotubes by an atomic layer deposition method. When an atomic layer deposition method is used to form the titanium dioxide layer, a titanium dioxide layer with high uniformity can be obtained without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO2/CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts.
- According to the method of fabricating photocatalysts of the present invention, in the step (d), preferably the titanium source may be selected from a group consisted of: titanium tetrachloride, tetraethoxy titanium, titanium isopropoxide, and mixtures thereof; and preferably the oxygen source may be selected from a group consisted of: water, hydrogen peroxide, oxygen, ozone, and mixtures thereof.
- According to the method of fabricating photocatalysts of the present invention, preferably the formation of the titanium dioxide layer in the step (d) is performed at a temperature of 50 to 400° C.; a pressure of 1 to 50 mbar; and an atmosphere comprising an inert gas such as nitrogen, neon, argon, krypton, xenon, or mixtures thereof.
- Preferably, the method of fabricating photocatalysts of the present invention may further comprise a step (e) after the step (d): removing the substrate to obtain a plurality of carbon nanotubes covered with the titanium dioxide layer. The carbon nanotubes lifted from the substrate are presented in a form of powder, which can be further applied to various usages such as sterilization powder, paint additives, fertilizer, or sanitary articles.
- According to the method of fabricating photocatalysts of the present invention, preferably the step (d) may be repeated for 1 to 1500 times.
- According to the method of fabricating photocatalysts of the present invention, the thickness of single titanium dioxide layer is preferably 0.5 Å to 1.7 Å, more preferably 0.5 Å to 1.0 Å.
- The method of fabricating photocatalysts of the present invention preferably further comprises a step (d1) after the step (d): annealing the carbon nanotubes that are located on the substrate and covered with the titanium dioxide layer.
- According to the method of fabricating photocatalysts of the present invention, the substrate is preferably a silicon-based substrate, a quartz substrate, or a glass substrate. Also, the substrate may preferably be a carbon fiber cloth in order to provide a photocatalyst filter.
- According to the method of fabricating photocatalysts of the present invention, in the step (b), the carbon nanotubes may be preferably single-wall or multi-wall carbon nanotubes.
- The present invention also provides a photocatalytic filter, which comprises: a substrate, a plurality of carbon nanotubes, and a titanium dioxide layer. The carbon nanotubes locate on the substrate, wherein ends of the carbon nanotubes connect to the substrate. Also, the titanium dioxide layer covers the surface of the carbon nanotubes.
- The photocatalytic filter of the present invention is a visible light absorbed photocatalysts filter that can be workable with visible light and therefore can be applied into various uses such as the filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter. In contrast, a traditional photocatalyst filter cannot work if the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature if no UV light is provided and therefore is limited to the place where it is used.
- In the prior arts, a photocatalysts filter is made by dipping a fiber cloth in a solution of titanium dioxide to form a titanium dioxide layer on the fiber cloth. Consequently, the surface area of the active surface of the photocatalysts filter is small since the surface area of the fiber cloth, on where the titanium dioxide layer can be formed, is small, and hence the photocatalysis efficiency cannot be efficiently increased. In the present invention, the area of the surface where the titanium dioxide layer can be formed on is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention is an improvement.
- According to the photocatalytic filter of the present invention, the substrate is preferably a carbon fiber cloth.
- According to the photocatalytic filter of the present invention, the thickness of the titanium dioxide layer is preferably 0.5 Å to 1000 Å.
- According to the photocatalytic filter of the present invention, the titanium dioxide layer covering the surface of the carbon nanotubes is preferably formed by an atomic layer deposition method.
- According to the photocatalytic filter of the present invention, the length of the carbon nanotubes is preferably 5-300 μm, but is not limited thereto.
- According to the photocatalytic filter of the present invention, the carbon nanotubes may preferably be single-wall or multi-wall carbon nanotubes.
- Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
-
FIG. 1 is a schematic view of a conventional photocatalyst filter; -
FIGS. 2A-2C show a process flow chart of fabricating a visible light absorbed TiO2/CNT photocatalysts of the example 1; -
FIG. 3 is a schematic view of a photocatalyst filter of the example 2; -
FIG. 4 is a schematic cross section view of a photocatalyst filter of the example 2; and -
FIGS. 5A-5D show a process flow chart of fabricating a visible light absorbed TiO2/CNT photocatalysts of the example 3. - Reference with
FIGS. 2A-2C , a process flow chart of fabricating a visible light absorbed TiO2/CNT photocatalysts is shown. First, (a) asubstrate 21 is provided as shown inFIG. 2A , wherein a silicon-based substrate is used. Then, (b) a plurality ofcarbon nanotubes 22 is formed on thesubstrate 21 by a CVD method, as shown inFIG. 2B . After that, (c) a titanium source and an oxygen source (not shown) are provided, and (d) by using an atomic deposition method, with conditions of 150° C. of temperature, 1 mbar of pressure, and a nitrogen atmosphere, the titanium source and the oxygen source are reacted to form atitanium dioxide layer 23 on thecarbon nanotubes 22. Then, the above step (d) is repeated for 800 times to increase the thickness of thetitanium dioxide layer 23. Subsequently, (d1) an annealing process is performed on thecarbon nanotubes 22 coated with the titanium dioxide layer 23 (not shown). Therefore, a visible light absorbed photocatalysts comprising asubstrate 21 havingcarbon nanotubes 22 thereon, in which thecarbon nanotubes 22 are coated with thetitanium dioxide layer 23, is obtained. In the present example, the titanium source used herein is titanium tetrachloride and the oxygen source used herein is water. - The photocatalyst of the present example is made by the utilizing of an atomic layer deposition method, the using of titanium tetrachloride as the titanium source, and the forming of nano-scaled titanium dioxide layer, and therefore is visible light absorbable, which cannot be realized by the conventional photocatalyst. The titanium dioxide layer of the photocatalysts of the present example has very high uniformity without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO2/CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts. The photocatalysts having TiO2/CNT structure made by the method of the present invention can be applied to a wider range compared with that of prior arts due to the visible light absorbed characteristic thereof, the titanium dioxide layer formed on the CNTs has high uniformity and therefore the photodegradation efficiency of the photocatalysts achieved by the method of the present invention is an improvement.
- The same method as described in the example 1 is used except that a carbon fiber cloth is used as the
substrate 21 to replace the silicon-based substrate. - Reference with
FIGS. 3 and 4 , a schematic view and a cross section view of a photocatalysts filter of the present example are shown, in whichFIG. 4 is the enlarged view of the cycled part shown in theFIG. 3 . The photocatalysts filter of the present example comprises a substrate 21 (i.e. the carbon fiber cloth), a plurality ofcarbon nanotubes 22, and atitanium dioxide layer 23. Thecarbon nanotubes 22 form on the surface of thesubstrate 21, ends 221 of thecarbon nanotubes 22 connect to the surface of thesubstrate 21, and thetitanium dioxide layer 23 covers the surface of thecarbon nanotubes 22 formed on thesubstrate 21. The length of thecarbon nanotubes 22 is about 300 μm. - According to the photocatalysts filter 2 of the present example, the
titanium dioxide layer 23 is formed covering thecarbon nanotubes 22 and the substrate 21 (i.e. the carbon fiber cloth) by an atomic layer deposition method, and therefore thephotocatalysts filter 2 is visible light-absorbable and can be applied into various uses such as a filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter. In contrast, a traditional photocatalyst filter cannot work if the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature if no UV light is provided and therefore is limited to the place where it is used. - Also, the traditional photocatalyst filter may have a problem is that the active surface thereof is small since the surface area of the fiber cloth, where the titanium dioxide layer can be formed on, is small, and hence the photocatalysis efficiency cannot be efficiently increased. In the present invention, the area of the surface on where the titanium dioxide layer can be formed is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention can be efficiently increased.
- Meanwhile, the energy band structure of the photocatalyst filter may be changed due to the core/shell (carbon nanotube/titanium dioxide layer) structure of the present invention, which may contribute to the increasing of the light absorbing efficiency and the photocatalysis efficiency of the photocatalyst filter.
- Reference with
FIGS. 5A-5D , a process flow chart of fabricating a visible light absorbed TiO2/CNT photocatalysts is shown. First, (a) a silicon-basedsubstrate 24 is provided as shown inFIG. 5A . Then, (b) a plurality ofcarbon nanotubes 22 is formed on thesubstrate 24 by a CVD method, as shown inFIG. 5B . After that, (c) a titanium source and an oxygen source (not shown) are provided, and (d) by using an atomic deposition method, with conditions of 150° C. of temperature, 1.5 mbar of pressure, and at a nitrogen atmosphere, the titanium source and the oxygen source are reacted to form atitanium dioxide layer 23 on thecarbon nanotubes 22. Then, the above step (d) is repeated for 800 times to increase the thickness of thetitanium dioxide layer 23. Subsequently, (d1) an annealing process is performed on thecarbon nanotubes 22 coated with the titanium dioxide layer 23 (not shown). Finally, the silicon-basedsubstrate 24 is removed to obtain the photocatalysts of the present example, as shown inFIG. 5D , wherein the photocatalysts of the present example comprisescarbon nanotubes 22 coated with thetitanium dioxide layer 23. In the present example, the titanium source used herein is titanium tetrachloride and the oxygen source used herein is water. - The photocatalysts prepared in the present example may be used as visible light absorbed photocatalyst powders and can be applied into various uses such as sterilization powder, paint additives, fertilizer, or sanitary articles.
- Accordingly, the present invention produces a method of fabricating visible light absorbed TiO2/CNT photocatalysts by utilizing an atomic layer deposition method with the use of titanium tetrachloride as the titanium source and water as the oxygen source, and therefore the photocatalysts made by the present invention are visible light absorbable, which cannot be realized by the conventional photocatalyst. According to the present invention, the titanium dioxide layer of has very high uniformity without the appearance of titanium dioxide agglomeration (granules) that are frequently seen in the conventional titanium dioxide layers formed by the sol-gel method. Therefore, the visible light absorbed TiO2/CNT photocatalysts formed by the method of the present invention have excellent photodegradation efficiency compared with that of the prior arts.
- Meanwhile, the present invention provides a photocatalyst filter having a core/shell (carbon nanotube/titanium dioxide layer) structure, and as a result the photocatalyst filter of the present invention is visible light absorbable and can be applied into various uses such as filtering net of an air conditioner without the limitation of the using of UV light sources. That is, there is no need to install UV light source equipment to provide artificial UV lights for the photocatalysts filter. In contrast, a traditional photocatalyst filter cannot work when the UV light exposure is absent, the photocatalyst of the traditional filters may lose its photocatalysis feature while no UV light is provided and therefore is limited to the place where it is used (i.e., a site with naturally-occurring UV light).
- In the prior arts, a photocatalysts filter is made by dipping a fiber cloth in a solution of titanium dioxide to form a titanium dioxide layer on the fiber cloth. Consequently, the surface area of the active surface of the photocatalysts filter is small since the surface area of the fiber cloth, where the titanium dioxide layer can be formed on, is small, and hence the photocatalysis efficiency cannot be efficiently increased. In the present invention, the area of the surface on where the titanium dioxide layer can be formed on is relatively large, because plural carbon nanotubes formed on the carbon fiber cloth may serve as bases for titanium dioxide layer to coat on. Therefore, the photocatalysis efficiency of the photocatalyst filter according to the present invention is an improvement.
- Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed.
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030147802A1 (en) * | 2001-11-21 | 2003-08-07 | William Marsh Rice University | Process for making single-wall carbon nanotubes utilizing refractory particles |
US20070196575A1 (en) * | 2006-02-21 | 2007-08-23 | Dominguez Juan E | Composite metal films and carbon nanotube fabrication |
US7459013B2 (en) * | 2004-11-19 | 2008-12-02 | International Business Machines Corporation | Chemical and particulate filters containing chemically modified carbon nanotube structures |
US20090075157A1 (en) * | 2004-10-06 | 2009-03-19 | Pak Chan-Ho | Carbon nanotube for fuel cell, nanocomposite comprising the same, method for making the same, and fuel cell using the same |
US20090175757A1 (en) * | 2007-05-14 | 2009-07-09 | Northwestern University | Titanium dioxide, single-walled carbon nanotube composites |
US20090186214A1 (en) * | 2006-05-17 | 2009-07-23 | University Of Dayton | Method of growing carbon nanomaterials on various substrates |
US20100178825A1 (en) * | 2007-01-03 | 2010-07-15 | Lockheed Martin Corporation | Cnt-infused carbon fiber materials and process therefor |
US20100254885A1 (en) * | 2009-04-03 | 2010-10-07 | Menchhofer Paul A | Carbon Nanotubes Grown on Bulk Materials and Methods for Fabrication |
US20110135827A1 (en) * | 2007-03-19 | 2011-06-09 | Electronic And Telecommunications Research Institute | Method of fabricating carbon nanotubes uniformly coated with titanium dioxide |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI324948B (en) * | 2005-12-22 | 2010-05-21 | Ind Tech Res Inst | Photocatalystic composite material, method for producing the same and application thereof |
-
2010
- 2010-02-06 TW TW099103615A patent/TWI410275B/en not_active IP Right Cessation
- 2010-04-06 US US12/662,212 patent/US8277742B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030147802A1 (en) * | 2001-11-21 | 2003-08-07 | William Marsh Rice University | Process for making single-wall carbon nanotubes utilizing refractory particles |
US20090075157A1 (en) * | 2004-10-06 | 2009-03-19 | Pak Chan-Ho | Carbon nanotube for fuel cell, nanocomposite comprising the same, method for making the same, and fuel cell using the same |
US7459013B2 (en) * | 2004-11-19 | 2008-12-02 | International Business Machines Corporation | Chemical and particulate filters containing chemically modified carbon nanotube structures |
US20070196575A1 (en) * | 2006-02-21 | 2007-08-23 | Dominguez Juan E | Composite metal films and carbon nanotube fabrication |
US20090186214A1 (en) * | 2006-05-17 | 2009-07-23 | University Of Dayton | Method of growing carbon nanomaterials on various substrates |
US20100178825A1 (en) * | 2007-01-03 | 2010-07-15 | Lockheed Martin Corporation | Cnt-infused carbon fiber materials and process therefor |
US20110135827A1 (en) * | 2007-03-19 | 2011-06-09 | Electronic And Telecommunications Research Institute | Method of fabricating carbon nanotubes uniformly coated with titanium dioxide |
US20090175757A1 (en) * | 2007-05-14 | 2009-07-09 | Northwestern University | Titanium dioxide, single-walled carbon nanotube composites |
US20100254885A1 (en) * | 2009-04-03 | 2010-10-07 | Menchhofer Paul A | Carbon Nanotubes Grown on Bulk Materials and Methods for Fabrication |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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WO2016205698A1 (en) * | 2015-06-17 | 2016-12-22 | California Institute Of Technology | Systems and methods for implementing robust carbon nanotube-based field emitters demonstrating enhanced field emission characteristics |
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US11433375B2 (en) * | 2016-12-19 | 2022-09-06 | University Of Cincinnati | Photocatalytic carbon filter |
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US10493432B2 (en) * | 2017-02-16 | 2019-12-03 | Carnegie Mellon University | Photocatalyst / carbon nanotube aerogel composites |
WO2018154572A1 (en) * | 2017-02-21 | 2018-08-30 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd | Vapor phase treatment of macroscopic formations of carbon nanotubes |
US11679981B2 (en) * | 2017-02-21 | 2023-06-20 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. | Vapor phase treatment of macroscopic formations of carbon nanotubes |
US11585546B2 (en) * | 2018-02-20 | 2023-02-21 | Samsung Electronics Co., Ltd. | Photocatalytic filter and air conditioning device comprising photocatalytic filter |
CN109999777A (en) * | 2019-05-22 | 2019-07-12 | 湖南云亭烯新材料科技有限公司 | A kind of graphene photocatalysis membrana |
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TW201127486A (en) | 2011-08-16 |
US8277742B2 (en) | 2012-10-02 |
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